Silver halide photographic light-sensitive material

Abstract

A silver halide black and white photographic light-sensitive material is disclosed, comprising a support having thereon two silver halide emulsion layers, wherein a silver halide emulsion layer provided further from the support contains tabular silver halide grains having an aspect ratio of not less than 3, another silver halide emulsion layer containing silver halide grains having an aspect ratio of not more than 2.5; both silver halide grain emulsions are each spectrally sensitized by adding thereto a spectral-sensitizing dye in the form of a dispersion of solid particles dispersed in an aqueous medium.

What is claimed is: 
     
       1. A silver halide black and white photographic light-sensitive material comprising a support having only two silver halide emulsion layers, wherein a first layer of the silver halide emulsion layers is provided further from the support than a second layer, said first layer comprising a first silver halide emulsion containing first silver halide grains having an average aspect ratio of grain diameter to grain thickness of not less than 3, and said second layer comprising a second silver halide emulsion containing second silver halide grains having an average aspect ratio of not more than 2.5; said first and second emulsions are each spectrally sensitized by adding thereto a spectral-sensitizing dye in the form of a dispersion of solid particles dispersed in an aqueous medium. 
     
     
       2. The photographic material of claim 1, wherein said first silver halide grains have an average aspect ratio of 3 to 8, accounting for not less than 50% of projected areas of total grains contained in the first layer. 
     
     
       3. The photographic material of claim 1, wherein said first silver halide grains are twinned crystal grains. 
     
     
       4. The photographic material of claim 1, wherein said second silver halide grains have an average aspect ratio of 1.0 to 2.0, accounting for not less than 50% of projected area of total grains contained in the second layer. 
     
     
       5. The photographic material of claim 1, wherein said second silver halide grains are regular crystal grains. 
     
     
       6. The photographic material of claim 1, wherein said first and second silver halide grains are silver iodobromide or silver iodochloride having an average iodide content of 0.05 to 2.0 mol %. 
     
     
       7. The photographic material of claim 1, wherein said dye has a solubility in water of 2×10 -4  to 4×10 -2  mol per liter at 27° C. 
     
     
       8. The photographic material of claim 1, wherein said dye is dispersed in water substantially free from an organic solvent and a surfactant.